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Histological assessment of systemic granulomatosis progression in meagre Argyrosomus regius during cage ongrowing phase. | LitMetric

AI Article Synopsis

  • Meagre Argyrosomus regius shows promise for Mediterranean aquaculture, but health issues like systemic granulomatosis (SG) hinder its sustainability.
  • A 10-month study on 108 meagre examined the impact of three diets (commercial pellets, hydrated pellets, defrosted sardines) on SG progression, with liver and kidney being the most affected organs.
  • Results indicated that feeding defrosted sardines and increased temperatures may reduce the severity of SG, suggesting a link between diet, environmental conditions, and the health of meagre.

Article Abstract

Meagre Argyrosomus regius is a potential candidate for Mediterranean aquaculture diversification, although several health issues still represent important bottlenecks for its sustainable production, including systemic granulomatosis (SG). To evaluate the SG progression in meagre during a 10 mo period of cage ongrowing, a histopathological investigation was carried out on 108 meagre fed 3 different diets (commercial pellets, hydrated commercial pellets and defrosted sardines). Histological sections of the gills and visceral organs were examined and lesions referable to SG scored from 1-3 according to the severity of the granulomatosis. The kidney and liver were the most affected organs, showing the highest percentage of positivity for granulomas and severity of lesions along the whole observation period. Using a statistical mixed model (GLMM) followed by odds ratio analysis, an effect of diet and temperature was found: the severity of liver and digestive tract SG scores decreased in the Cage 3 group (defrosted sardines) and with increasing temperature (p < 0.05, negative estimates, odds ratio <1). These observations, in accordance with the literature, suggest that SG in meagre could be related to nutritional-metabolic factors with the possible influence of environmental factors such as temperature.

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Source
http://dx.doi.org/10.3354/dao03606DOI Listing

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